Support model classes in namespaces.
Fix generators for namespaced models.
Add working test helper (borrowed from Paperclip), test for namespaced models.
Don't use deconstantize or safe_constantize, for old Rails versions.
Use Rails' deconstantize method if available.
Use the version string instead of duck-typing.
Merge pull request #7 from cpence/master

Support model classes in namespaces